Play works and exit works. Though the guide menu doesn't work and return in the credits menu doesn't work. You also can't exit to the main menu at the end of the game.
On to the game itself. The art is nice and the limited use of colours helps guide the player through the levels. Though often at a junction the arrow starts at the option to go back, which is pretty annoying when you want to quickly move through the pipes and press space too quickly.